* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100vw;
    height: 100vh;
    font-family: Avenir, Helvetica Neue, Arial, Helvetica, sans-serif;
    overflow-x: hidden;
}

.text-center {
    text-align: center !important;
}

.text-left {
    text-align: left !important;
}

.text-right {
    text-align: right !important;
}


/* 浮动相关的class  */

.fl {
    float: left;
}

.fr {
    float: right;
}


/* flex相关的class */

.flex {
    display: flex;
}

.flex-a {
    display: flex;
    justify-content: space-around;
}

.flex-b {
    display: flex;
    justify-content: space-between;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}


/* 背景相关 */

.bg-fff {
    background: #fff;
}


/* 字体加粗 */

.fb {
    font-weight: bold;
}

.blod {
    font-weight: bold;
}


/* 字体大小 */

.f12 {
    font-size: 12px;
}

.f14 {
    font-size: 14px;
}

.f16 {
    font-size: 16px;
}

.f18 {
    font-size: 18px;
}

.f20 {
    font-size: 20px;
}

.f22 {
    font-size: 22px;
}

.f24 {
    font-size: 24px;
}

.f26 {
    font-size: 26px;
}

.f28 {
    font-size: 28px;
}

.f30 {
    font-size: 30px;
}

.f32 {
    font-size: 32px;
}

.f34 {
    font-size: 34px;
}

.f36 {
    font-size: 36px;
}

.f38 {
    font-size: 38px;
}

.f40 {
    font-size: 40px;
}